Let's take a #C-Cl# bond. Here the chlorine atom is more electronegative than the carbon atom, so will therefore have more electrons on its side. The charge on the atoms can be represented by using #delta+# or #delta-# depending on the charge., in the case of a #C-Cl# bond, it would be #C^(delta+)-Cl^(delta-)#, except it would be directly above the symbol usually.